linux-kernel - [PATCH 3/3] reiserfs: use hweight

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Message-Id: <1306763595-13908-3-git-send-email-akinobu.mita@gmail.com>
Date:	Mon, 30 May 2011 22:53:15 +0900
From:	Akinobu Mita <akinobu.mita@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	Akinobu Mita <akinobu.mita@...il.com>,
	reiserfs-devel@...r.kernel.org
Subject: [PATCH 3/3] reiserfs: use hweight_long

Use hweight_long() to count free bits in the bitmap.

Signed-off-by: Akinobu Mita <akinobu.mita@...il.com>
Cc: reiserfs-devel@...r.kernel.org
---
 fs/reiserfs/bitmap.c |    6 +-----
 1 files changed, 1 insertions(+), 5 deletions(-)

diff --git a/fs/reiserfs/bitmap.c b/fs/reiserfs/bitmap.c
index f9e26c1..69d7137 100644
--- a/fs/reiserfs/bitmap.c
+++ b/fs/reiserfs/bitmap.c
@@ -1219,15 +1219,11 @@ void reiserfs_cache_bitmap_metadata(struct super_block *sb,
 	info->free_count = 0;
 
 	while (--cur >= (unsigned long *)bh->b_data) {
-		int i;
-
 		/* 0 and ~0 are special, we can optimize for them */
 		if (*cur == 0)
 			info->free_count += BITS_PER_LONG;
 		else if (*cur != ~0L)	/* A mix, investigate */
-			for (i = BITS_PER_LONG - 1; i >= 0; i--)
-				if (!test_bit_le(i, cur))
-					info->free_count++;
+			info->free_count += BITS_PER_LONG - hweight_long(*cur);
 	}
 }
 
-- 
1.7.4.4

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